hw3

build.gradle

@@ -1,6 +1,7 @@
 plugins {
     id 'war'
     id 'org.gretty' version '2.2.0'
+    id 'io.franzbecker.gradle-lombok' version '1.14'
 }
 
 repositories {
@@ -11,9 +12,19 @@ repositories {
 sourceCompatibility = 10
 
 dependencies {
+    // https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind
+    compile group: 'com.fasterxml.jackson.core', name: 'jackson-databind', version: '2.9.7'
+
+    compile 'com.fasterxml.jackson.core:jackson-databind:2.9.6'
+
     compileOnly 'javax.servlet:javax.servlet-api:4.0.1'
 }
 
 gretty {
     contextPath = '/'
 }
+
+lombok {
+    version = '1.18.2'
+    sha256 = ""
+}

src/main/java/DTO/Order.java

@@ -0,0 +1,10 @@
+package DTO;
+import lombok.Data;
+
+import java.util.List;
+
+public @Data class Order {
+    private int id;
+    private String orderNumber;
+    private List<OrderItem> orderRows;
+}

src/main/java/DTO/OrderItem.java

@@ -0,0 +1,9 @@
+package DTO;
+
+import lombok.Data;
+
+public @Data class OrderItem {
+    private String itemName;
+    private Integer quantity;
+    private Integer price;
+}

src/main/java/api/Orders.java

@@ -1,42 +1,72 @@
 package api;
 
+import DTO.Order;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+import javax.servlet.ServletContextEvent;
+import javax.servlet.ServletContextListener;
 import javax.servlet.ServletException;
+import javax.servlet.annotation.WebListener;
 import javax.servlet.annotation.WebServlet;
 import javax.servlet.http.HttpServlet;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 import java.io.IOException;
-import java.util.regex.Matcher;
+import java.util.HashMap;
-import java.util.regex.Pattern;
+import java.util.Map;
 import java.util.stream.Collectors;
 
-@WebServlet("/api/orders")
+@WebServlet(urlPatterns = "/api/orders", name="Orders")
-public class Orders extends HttpServlet {
+@WebListener
+public class Orders extends HttpServlet implements ServletContextListener {
     private static final long serialVersionUID = 1L;
-    private int lastOrderId = 0;
+    private static int nextOrderId = 0;
-    private Pattern orderPattern = Pattern.compile(".*\"orderNumber\":\\s*\"(.*)\".*");
+    private static Map orders = new HashMap<Integer, Order>();
+
+    public int addOrder(Order order) {
+        int orderId = nextOrderId;
+        nextOrderId++;
+        order.setId(orderId);
+        orders.put(orderId, order);
+        return orderId;
+    }
 
     @Override
     protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
-        resp.getWriter().format("%d", lastOrderId);
+        String idString = req.getParameter("id");
+        if (idString != null) {
+            int id = Integer.parseInt(idString);
+            Order order = (Order) orders.get(id);
+            if (order == null) {
+                resp.setStatus(404);
+                return;
+            }
+            resp.setContentType("application/json");
+            resp.getWriter().print(new ObjectMapper().writeValueAsString(order));
+            return;
+        }
+        resp.getWriter().format("%s %d", getServletName(), orders.size());
     }
 
     @Override
     protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
         resp.setContentType("application/json");
-        String order = req.getReader().lines().collect(Collectors.joining(" "));
+        String orderJson = req.getReader().lines().collect(Collectors.joining(" "));
-        int orderId = lastOrderId++;
-        Matcher matcher = orderPattern.matcher(order);
-        boolean matches = matcher.matches();
 
-        if (matches && matcher.groupCount() > 0) {
+        Order order = new ObjectMapper().readValue(orderJson, Order.class);
-            String orderNumber = matcher.group(1);
+        addOrder(order);
-            System.out.format("request data: %s, orderNumber: %s\n", order, orderNumber);
+        resp.getWriter().print(new ObjectMapper().writeValueAsString(order));
-            resp.getWriter().printf("{\"id\": %d, \"orderNumber\": \"%s\"}", orderId, orderNumber);
-        } else {
-            resp.getWriter().print("\"Invalid request\"");
-        }
 
+    }
+
+    @Override
+    public void contextInitialized(ServletContextEvent sce) {
+        // fixme horrible hack
+        sce.getServletContext().setAttribute("Orders", this);
+    }
+
+    @Override
+    public void contextDestroyed(ServletContextEvent sce) {
 
     }
 }

src/main/java/form/Index.java

@@ -0,0 +1,17 @@
+package form;
+
+import javax.servlet.ServletException;
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+
+@WebServlet(urlPatterns = "/", name="Index")
+public class Index extends HttpServlet {
+
+    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+        response.setContentType("text/html; charset=utf-8");
+        response.getWriter().print("<a href=/orders/form>Orders form</a>");
+    }
+}

src/main/java/form/OrdersForm.java

@@ -0,0 +1,50 @@
+package form;
+
+import DTO.Order;
+import api.Orders;
+
+import javax.servlet.ServletException;
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+
+@WebServlet(urlPatterns = "/orders/form", name="OrdersForm")
+public class OrdersForm extends HttpServlet
+{
+    @Override
+    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+
+        resp.setContentType("text/html; charset=utf-8");
+        resp.getWriter().print(
+                "<form  method=post>" +
+                "<label for=orderNumber>Order Number</label> " +
+                "<input type=text name=orderNumber></input> " +
+                "<input type=submit></input>" +
+                "</form>"
+        );
+    }
+
+    @Override
+    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        resp.setContentType("application/json");
+        // fixme horrible hack
+        Orders orders = (Orders) getServletContext().getAttribute("Orders");
+        if (orders == null) {
+            throw new NullPointerException("Orders servlet not found");
+        }
+
+        String orderNumber = req.getParameter("orderNumber");
+        if (orderNumber == null) {
+            resp.setStatus(400, "orderNumber parameter is empty");
+            resp.getWriter().print("orderNumber parameter is empty");
+            return;
+        }
+
+        Order order = new Order();
+        order.setOrderNumber(orderNumber);
+        int orderId = orders.addOrder(order);
+        resp.getWriter().format("%d", orderId);
+    }
+}

src/main/java/test/HelloServlet.java

@@ -7,7 +7,7 @@ import javax.servlet.http.HttpServlet;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 
-@WebServlet("/hello")
+@WebServlet(urlPatterns = "/hello", name="Hello")
 public class HelloServlet extends HttpServlet {
     private static final long serialVersionUID = 1L;